Stability enhancement of digital predistortion through iterative methods to solve system of equations

The parameters of DPD system solved by Gauss-Seidel method are more stable in comparison to these solved by LMS method. This means, that the stability of the DPD system is improved by using the iterative methods to solve the DPD equation system. Furthermore the old parameters can be used as initial value for calculation of next DPD parameters. This can reduce the computation cost. Because of the improved stability, the degree of freedom of DPD algorithms can be increased, e.g. by means of raising the order in polynomial DPD.